after we had a second child, he says, we registered them both as twi twin twins. this father says that they have children in different cities or towns and register them later or even pay up to $1,000 for an illegal broker to fabricate documents, but they live with the fear of being caught and paying big fines. how effective is the one-child policy been? well, over the past 30 years, it is estimated to have reverted 100s of millions of births. now there are always some families though who are going to be able to find a loophole or simply cough up the cash to have the precious second child. >> i'm very as you say the luckiest girl in the world. >> reporter: why? because she has a big sister. more than 20 years ago, her parents paid a big price to have two kids, not just a big fine. >> my father lose his job. >> reporter: he lost his job? >> yes. and he and my mother also lost her job. >> reporter: yes, the father says, once i had two kids, i lost my job. but i'm not scared of that. i don't care. the most important thing is to raise my kids. this is for happiness. th